Ep. 1: Makoto's Trouble!

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Makoto confesses to Nagisa his distress over Haruka’s constant nudity. Recalling a shopping trip where Haruka abandoned him to enter a fish tank, the pair designs experiments to identify the trigger. They test various water containers, including cupped hands, a basin, a bucket, and a tub. Haruka shows increasing interest, nearly removing his tie at the sight of the tub. Finally, while assembling a small pool, Haruka spots them, strips immediately, and jumps in. Drenched, Makoto and Nagisa realize Haruka requires full body submersion before undressing.